Grindstone and mechanism for the same



(No Model.)

. H. A. AXTELL. GRINDSTONE AND MEOHANISM FOR THE SAME. No. 404,670.Patented June 4, 1889.

1 Flu I x 1 N l l v N P V m: N

o e I 1 UNITED STATES PATENT OFFICE.

HENRY A. AXTELL, OF MONTAGUE, MASSACHUSETTS.

GRl-NDSTONE AND MECHANISM FOR THE SAME.

SPECIFICATION forming part of Letters Patent No. 404,670, dated June 4,1889.

Application filed'tl'uly 27, 1888- Serial No. 281,159. (No model.)

To all whom it may concern:

Be it known that I, HENRY A. AXTELL, a citizen of the United States,residing at Montague, in the county of Franklin and State ofMassachusetts, have invented certain new and useful Improvements inGrindstones and Operating Mechanism for the Same; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

My invention is an improvement in machin cry for operatin g grindstones,and has for its object to give the usual rotary motion to a grindstoneand at the same time to impart a reciprocating lateral movement to thesame,

so that a very narrow surface of stone onlyis required to grind anarticle its entire length while said article is held in a fixedposition.

The rotary movement is imparted to the grindstone through a pulley-wheelor crank connected by ordinary means to the source of power. The lateralreciprocating movement is given to the stone during its rotary motion,as hereinafter shown and described, in either of two ways. First, apulley is connected by a belt or other similar means to the pulley ofthe driving-shaft of a motor, and in connection with said pulley is agrooved head-block provided with a face grooved in dovetail form as waysfor a sliding block pivoted to the shaft which carries the grindstone,through a pitman provided with a yoke pivoted to a collar which embracesthe end of the grindstone drivingshaft. A bolt passing through thesliding block of the head-block and fitting into the groove of the baseof the said head-block serves, when siutably adjusted, to regulate theleverage and throw to the reciprocating grindstone-shaft.

In the alternate arrangement for reciprocatin g the grindstone Idispense with the headblock and use a simple slotted lever pivoted atthe base of the frame of the grindstone and connected to the enginedriving-shaft or some intermediate shaft by means of a crank and pitman,the latter being, asin the first instance, connected to thegrindstone-shaft by a yoke. In my drawings, illustrating my invention,Figure 1 is a plan view showing the grindstone and the apparatus forbringing about the simultaneous reciprocating and rotary motions fixedsuitable journal-boxes, as B,ffor the grindstone-shaft.

C is the grindstone, which in my arrangement may be very narrow, fixedor keyed to a driving-shaft E- On one end of this shaft is a pulleyD,which is connected bya belt to the motor, and upon the opposite end ofsaid shaft is provided an annular groove, about which is fitted looselyan annular ring or collar c.

Extending from the box A is a bar A, from the outer end of which drops aleg A This leg and bar serves as a support to a journal bearing A whichincloses the journal of a shaft H. The shaft H is provided on one endwith a pulley d, and fixed to the opposite end of said shaft is thehead-block I, provided with a rectangular groove 6 and a dovetail groovef, connected by a slot f. These slots and grooves run longitudinallywith the body of said block and form ways for a sliding block K, ofdovetail form, and the bolt K with a flat head k. The bolt K may befixed to any point in its slot and groove by means of a nut h, whichclamps the head-block and sliding block firmly together. Pivoted to thesliding block K is a pitman F, provided with ayoke a, which embraces theannular collar 0, and is thereto pivoted by the screws 1).

Motion is imparted to the shafts E and H, from the motor employed, inany suitable wellknown manner simultaneously, and while the grindstoneis being rotated about its axis from the pulley D it receives itsreciprocating movem cut through pulley d, shaft H, blocks I and K, andpitman F, the latter of which is allowed free play, being pivoted in itsconnections to the sliding block K and the shaft-collar c.

In order to exhibit the alternate arrangement in which I dispense withthe head-block, I provide an arm N, fixed to the bottom of the box A,and to the end of this arm I pivot a lever 0, provided with a slot 1).The headblock on the shaft H and the sliding block being dispensed with,a crank Q, connected or pivoted to the shaft II, is pivoted to thepitman F. This is only another Way of converting rotary intoreciprocating motion, and is only mentioned to illustrate that, althoughthe head-block arrangement is preferred, other well-known means may beemployed to reciprocate the grindstone during its rotation.

The advantages of the double-acting grindstone are obvious, and hardlyneed be meutioned.

The body and arms of the person holding the article being ground may befixed and Without movement while the grindstone is moving, so that thearticle, with reference to the surface of the stone, may be absolutelywithout movement, it desirable, thus insuring more even and perfect Worc. Less labor and skill is required of the grinder, as he is notrequired to be constantly in motion in adj usting his article beingground and his own body to keep the surface of the article to normalbearing on the stone.

Having thus described my invention, What I claim as new, and desire tosecure by Letters Patent, is

The combination,with a rotary shaft and a pulley fixed thereon, thegrooved head-block fixed to said shaft, and the block. K, adjustablysecured to said head block by a bolt, the head of Which fits in thegroove of the said block, of a shaft arranged at right angles to thehead-block shaft, provided with a pulley, a grindstone, and a loosecollar, substantially as described, and the pitmau, as described,pivoted to the said loose collar, and the block K, as and for thepurpose described.

In testimony whereof I affix my signature in presence of two witnesses.

HENRY A. AX'IELL.

\Vitnesses:

RICHARD N. OAKMAN, J12, llA'r'rirz E. SMITH.

